A flip book or flick book is a book with a series of pictures that vary gradually from one page to the next, so that when the pages are turned rapidly, the pictures appear to animate by simulating motion or some other change. Flip books are often illustrated books for children, but may also be geared towards adults and employ a series of photographs rather than drawings. Flip books are not always separate books, but may appear as an added feature in ordinary books or magazines, often in the page corners. Software packages and websites are also available that convert digital video files into custom-made flip books.

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Flip books are essentially a primitive form of animation. Like motion pictures, they rely on persistence of vision to create the illusion that continuous motion is being seen rather than a series of discontinuous images being exchanged in succession; this is also known as the phi phenomenon. Rather than "reading" left to right, a viewer simply stares at the same location of the pictures in the flip book as the pages turn. The book must also be flipped with enough speed for the illusion to work, so the standard way to "read" a flip book is to hold the book with one hand and flip through its pages with the thumb of the other hand. The German word for flip book—Daumenkino, literally "thumb cinema"—reflects this process.

The first flip book appeared in September, 1868, when it was patented by John Barnes Linnett under the name kineograph ("moving picture"). They were the first form of animation to employ a linear sequence of images rather than circular (as in the older phenakistoscope). The German film pioneer, Max Skladanowsky, first exhibited his serial photographic images in flip book form in 1894, as he and his brother Emil did not develop their own film projector until the following year. In 1894, Herman Casler invented a mechanized form of flip book called the Mutoscope, which mounted the pages on a central rotating cylinder rather than binding them in a book. The mutoscope remained a popular attraction through the mid-twentieth century, appearing as coin-operated machines in penny arcades and amusement parks. In 1897, the English filmmaker Henry William Short marketed his "Filoscope", which was a flip book placed in a metal holder to facilitate flipping.

Flip books are now largely considered a toy or novelty for children, and were once a common "prize" in cereal and Cracker Jack boxes. However, in addition to their role in the birth of cinema, they have also been an effective promotional tool since their creation for such decidedly adult products as automobiles and cigarettes. They continue to be used in marketing today, as well as in art and published photographic collections. Vintage flip books are popular among collectors, and especially rare ones from the late 19th to early 20th century have been known to fetch thousands of dollars in sales and auctions.